Drinking straw



FIG. 1 is a right side elevation view of a drinking straw showing my new design, the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a rear elevation view thereof. 

The ornamental design for the drinking straw, as shown and described. 